[PATCH 12/16] drm/amd/display: turn off eDP lcdvdd and backlight if not required

[Roman.Li]

From: Charlene Liu <charlene....@amd.com>

[why]
A+N configuration, eDP on A-APU is off, extended display active.
Resume from s4, eDP's backlight is still on.

[how]
Turn off inactive eDP backlight and lcdvdd.

Reviewed-by: Charlene Liu <charlene....@amd.com>
Reviewed-by: Aric Cyr <aric....@amd.com>
Signed-off-by: Charlene Liu <charlene....@amd.com>
Signed-off-by: Jing Zhou <jing.z...@amd.com>
Signed-off-by: Roman Li <roman...@amd.com>
---
 drivers/gpu/drm/amd/display/dc/core/dc.c                      | 4 ++--
 .../amd/display/dc/link/protocols/link_edp_panel_control.c    | 2 ++
 2 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/amd/display/dc/core/dc.c 
b/drivers/gpu/drm/amd/display/dc/core/dc.c
index 636999fcaebb..66e23507eb82 100644
--- a/drivers/gpu/drm/amd/display/dc/core/dc.c
+++ b/drivers/gpu/drm/amd/display/dc/core/dc.c
@@ -6298,10 +6298,10 @@ void dc_query_current_properties(struct dc *dc, struct 
dc_current_properties *pr
 void dc_set_edp_power(const struct dc *dc, struct dc_link *edp_link,
                                 bool powerOn)
 {
-       if (edp_link->connector_signal != SIGNAL_TYPE_EDP)
+       if (!edp_link || !edp_link->dc || !edp_link->dc->link_srv)
                return;
 
-       if (edp_link->skip_implict_edp_power_control == false)
+       if (edp_link->connector_signal != SIGNAL_TYPE_EDP)
                return;
 
        edp_link->dc->link_srv->edp_set_panel_power(edp_link, powerOn);
diff --git 
a/drivers/gpu/drm/amd/display/dc/link/protocols/link_edp_panel_control.c 
b/drivers/gpu/drm/amd/display/dc/link/protocols/link_edp_panel_control.c
index da74c2b5854f..f50c4dbc7553 100644
--- a/drivers/gpu/drm/amd/display/dc/link/protocols/link_edp_panel_control.c
+++ b/drivers/gpu/drm/amd/display/dc/link/protocols/link_edp_panel_control.c
@@ -393,6 +393,7 @@ void edp_set_panel_power(struct dc_link *link, bool powerOn)
 
                // 3. Rx power on
                dpcd_write_rx_power_ctrl(link, true);
+               DC_LOG_BACKLIGHT("eDP power and backlight: Power on");
        } else {
                // 3. Rx power off
                dpcd_write_rx_power_ctrl(link, false);
@@ -404,6 +405,7 @@ void edp_set_panel_power(struct dc_link *link, bool powerOn)
                // 1. panel VDD off
                if (!link->dc->config.edp_no_power_sequencing)
                        link->dc->hwss.edp_power_control(link, false);
+               DC_LOG_BACKLIGHT("eDP power and backlight: Power off");
        }
 }
 
-- 
2.34.1